#13362: Fix bug in build_flow_graph
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Reporter: dcoudert | Owner: jason, ncohen, rlm
Type: defect | Status: needs_review
Priority: critical | Milestone: sage-5.3
Component: graph theory | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: David Coudert | Merged in:
Dependencies: | Stopgaps:
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Comment (by dcoudert):
It wasn't in the doctests. In fact the existence of 0-cost cycles in flows
depends on the LP solver and the instance. Some LP solver simplifies the
solution returning the minimum possible number of non zero variables.
I added some very artificial doctests, but it does the job.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/13362#comment:5>
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